Lighting unit



R. F. LESTER LIGHTING UNIT July 3, 1956 Filed Dec. 3, 1953 2.25:: l KRC MCM@ Ao/YNE Y.,

il nit States Patent O LIGHTING UNIT Ray F. Lester, Syracuse, N. Y., assigner to Crouse-Hinds Company, Syracuse, N. Y., a corporation of New Yori:

Application December 3, 1953, Serial No. 395,931

2 Claims. (Cl. 24m-128) This invention relates to electrical lighting units of the type commonly used in industrial installations, and which consists of a metallic body in which the lamp receptacle is mounted and a relatively large shade, usually formed out of light gauge sheet metal, is attached to the body. The invention has to do more particularly with a structural arrangement for mounting the shade on the body of the unit.

The invention has as an object a lighting unit embodying a structural arrangement by which the shade is quickly and conveniently attached to the body, the attachment being of a yielding nature whereby the shade is permitted to yield relative to the body and shocks imparted to the shade are not transmitted to the body and, because of the yielding mount, the shade is less likely to be damaged.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

ln describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

In the drawings:

Figure l is a side elevational View of a lighting unit embodying my invention, parts being broken away and parts being shown in vertical section.

Figure 2 is a bottom plan view of the annular shade mounting member.

Figure 3 is an enlarged fragmentary sectional view of the upper left-hand portion of Figure l.

The unit consists of a body provided at its upper end with the usual internally threaded hub 11 for attachment to a conduit line. A lamp receptacle 12 is carried by the body, and the receptacle and lamp 13 are usually enclosed by a glass globe 14 which may be encircled by a protective guard member 15.

The body 10 is formed with a cylindrical flange portion 16 formed on its peripheral surface with a circumferentially extending groove. The flange 16 is embraced by an annular member 17. The member 17 is formed of rubber, or rubberlike material, and is initially formed with a diameter somewhat less than that of the cylindrical portion 16, whereby the annular member is contracted into snug engagement with the ange. To aid in preventing displacement of the annular member, it is formed on its inner surface with an inwardly extending rib 1E positioned in the groove formed in the ange of the body. The annular member 1'7 is substantially channel shaped in cross section, and the outer surface of the inner wall of the annular member is formed with screw threads. The shade 19 is formed with a substantially cylindrical neck portion 20, also provided with threads complemental to those on the annular member, whereby the neck of the shade may be threaded onto the annular member, as more clearly shown in Figure 3. The outer wall 21 of the annular member depends downwardly for engaging the body of the shade.

With this arrangement, the shade is yieldingly mounted on the body of the unit to have limited universal movement relative thereto and, because of the: high frictional coeicient between the neck of the shade and the rubber annular member 17, the shade will not become loosened from the body. This is further prevented by the engagement of the outer flange or wall portion 21 of the annular member with the contiguous portion of the shade.

What I claim is:

l. A lighting unit comprising a body formed with a cylindrical portion having a circumferentially extending groove in the outer surface thereof, an annular member of inverted channel formation formed of rubberlike material contractively embracing said cylindrical portion of the body and being formed on its inner surface with a rib positioned in said groove, the outer surface of the inner wall of said channel formation being formed with screw threads, a shade formed with a neck portion at its upper end extending in said channel formation and being threaded on the inner wall thereof, the outer wall of said channel formation extending in concentric spaced relation to said neck portion, and the edge of said outer wall engaging the body portion of the shade.

2. A lighting unit comprising a rigid body formed with a cylindrical portion, an annular member of inverted channel formation formed of rubberlike material contractively embracing said cylindrical portion of the body, the outer surface of the inner wall of said channel formation being formed with screw threads, a shade formed with a neck portion at its upper end extending into said channel formation and being threaded on the inner wall thereof, the outer wall of said channel formation extending in concentric spaced relation to said neck portion, and the edge of said outer wall engaging the body portion of the shade.

References Cited in the file of this patent UNITED STATES PATENTS 1,791,625 Kollath Feb. 10, 193i 1,902,023 Gallagher Mar. 2l, 1933 1,943,852 Anderson Jan. 16, 1934 FOREIGN PATENTS 220,446 Great Britain Aug. 2l, 1924 326,083 Great Britain Mar. 6, 1930 

